The five best React calendar components—and an alternative

The text discusses the use of React's components feature, particularly focusing on calendar components. It explains that these components are reusable pieces that can be used to create everything from a simple button to an entire app. A commonly needed component is a calendar for picking dates. Several popular pre-built React calendar components are listed and their features are discussed. These include react-datepicker, react-calendar, react-big-calendar, react-infinite-calendar, and React DayPicker. The text also mentions the benefits of using these pre-built components such as saving time, improved performance, predictable user experience, and customizability. Additionally, it provides a brief overview on how to build your own calendar component in React.